我们可以做个简单的测试,在Django命令行下,我们创建一个username为phith0n的用户,然后再次创建一个username为phith0n的用户,则会抛出一个IntegrityError异常:...return for dj_exc_type in ( DataError, OperationalError, IntegrityError...if dj_exc_type not in (DataError, IntegrityError): self.wrapper.errors_occurred = True...six.reraise(dj_exc_type, dj_exc_value, traceback) 其中exc_type是异常,如果其类型是DataError,OperationalError,IntegrityError
session.commit() # 提交到数据库 如果name字段(nullable=False)不传,会抛出异常:"Column 'name' cannot be null" sqlalchemy.exc.IntegrityError...: (pymysql.err.IntegrityError) (1048, "Column 'name' cannot be null") [SQL: INSERT INTO user (name, tel...session.commit() # 提交到数据库 重复添加相同的tel,会抛出异常: 1062, "Duplicate entry '10086' for key 'tel'" sqlalchemy.exc.IntegrityError...: (pymysql.err.IntegrityError) (1062, "Duplicate entry '10086' for key 'tel'") [SQL: INSERT INTO user
在代码块上加事务可以用 withtransaction.atomic():上下文管理器 如果想在事务rollback的时候操作,一定要在with外面加except from django.db import IntegrityError...create_parent() try: with transaction.atomic(): generate_relationships() except IntegrityError...transaction.savepoint() try: b.save() # Could throw exception transaction.savepoint_commit(sid) except IntegrityError
exception InterfaceError exception DatabaseError exception DataError exception OperationalError exception IntegrityError...models.ProtectedError is a subclass of IntegrityError. Http异常 HTTP异常由django.http导入。
do_other_stuff() 一旦把atomic代码块放到try/except中,完整性错误就会被自然的处理掉了,比如下面这个例子: from django.db import IntegrityError...create_parent() try: with transaction.atomic(): generate_relationships() except IntegrityError...下面的是函数嵌套上下文的例子: from django.db import IntegrityError, transaction @transaction.atomic def viewfunc(request...except IntegrityError: handle_exception() add_children() 这个例子中,即使generate_relationships...担心主要集中在DatabaseError和它的子类(如IntegrityError)。如果这种异常真的发生了,事务就会被破坏掉,而Django会在代码运行完后执行回滚操作。
如果你正在使用MySQL,请确保使用READ COMMITTED 隔离级别而不是默认的REPEATABLE READ,否则你将会遇到get_or_create 引发IntegrityError 但对象在接下来的
pymysql\err.py", line 143, in raise_mysql_exception raise errorclass(errno, errval) pymysql.err.IntegrityError
'author', lazy='dynamic') @staticmethod def generate_fake(count=100): from sqlalchemy.exc import IntegrityError...forgery_py.date.date(True)) db.session.add(u) try: db.session.commit() except IntegrityError
DATETIME', 'DBAPISet', 'DataError', 'DatabaseError', 'Date', 'DateFromTicks', 'Error', 'FIELD_TYPE', 'IntegrityError
如果后端数据库有强制关联操作,这是容易报错:IntegrityError,除非你在数据库中手动添加了SQL的ON DELETE约束。
Python教程",readcount=0,commentcount=0) 注意: 如果你的新增操作包含了一个你手动设置的主键值,而且如果这个值已经存在于数据库中,那么对 create() 的调用就会以一个 IntegrityError
generate_password_hash(password)), ) db.commit() except db.IntegrityError
Content-Type: text/plain; charset=utf-8 X-Frame-Options: SAMEORIGIN Content-Length: 19853 Vary: Cookie IntegrityError
# 删除关联数据,与之关联也删除 models.CASCADE # 删除关联数据,引发错误IntegrityError models.DO_NOTHING # 删除关联数据,引发错误ProtectedError
django.http import HttpResponse from index.models import Author,Count from django.db import transaction,IntegrityError...transaction.savepoint_commit(sid) # open transaction still contains author.save() and count.save() except IntegrityError
_param_generator(params)) cx_Oracle.IntegrityError: ORA-01400: cannot insert NULL into ("DJANGO"."..._param_generator(params)) django.db.utils.IntegrityError: ORA-01400: cannot insert NULL into ("DJANGO
CASCADE 级联删除,此类选项模仿SQL语句ON DELETE CASCADE,再删除此字段信息的时候同时删除包含ForeignKey字段的目标(object) PROTECT 通过django.db.IntegrityError...若数据库提高了引用完整性,则此种设置会抛出一个IntegrityError,除非对这一数据字段手动添加了SQL语句中的ON DELETE字段 还可以通过设置abstract属性来定义一个抽象类: from
connections.py", line 36, in defaulterrorhandler raise errorclass, errorvalue _mysql_exceptions.IntegrityError
, (uid, file.filename,)) except sqlite3.IntegrityError: return "Duplicate file" conn.commit
异常 异常 说明 DataError 处理数据时出现问题 OperationalError 数据库操作执行期间出现问题 IntegrityError
领取专属 10元无门槛券
手把手带您无忧上云